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Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail- to-Rail …

Low Power, 1 nV/ Hz, G 10 Stable, Rail- to-Rail Output Amplifier Data Sheet ada4895 -1/ ada4895 -2. FEATURES FUNCTIONAL BLOCK DIAGRAMS. Low wideband noise NC 1 8 DISABLE. 1 nV/ Hz IN 2 7 +VS. pA/ Hz +IN 3 6 OUT. VS 4 NC. Low 1/f noise: 2 nV/ Hz at 10 Hz ada4895 -1 5. 10186-102. Low distortion (SFDR): 96 dBc at 100 kHz, VOUT = 2 V p-p NC = NO CONNECT. DO NOT. CONNECT TO THIS PIN. Low power: 3 mA per amplifier Figure 1. ada4895 -1 Single Amplifier (8-Lead SOIC). Low input offset voltage: 350 V maximum High speed OUT1 1 10 +VS. 236 MHz, 3 dB bandwidth (G = +10) IN1 2 9 OUT2.

Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail-to-Rail Output Amplifier Data Sheet ADA4895-1/ADA4895-2 FEATURES Low wideband noise 1 nV/√Hz . 1.6 pA/√Hz +IN. Low 1/f noise: 2

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Transcription of Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail- to-Rail …

1 Low Power, 1 nV/ Hz, G 10 Stable, Rail- to-Rail Output Amplifier Data Sheet ada4895 -1/ ada4895 -2. FEATURES FUNCTIONAL BLOCK DIAGRAMS. Low wideband noise NC 1 8 DISABLE. 1 nV/ Hz IN 2 7 +VS. pA/ Hz +IN 3 6 OUT. VS 4 NC. Low 1/f noise: 2 nV/ Hz at 10 Hz ada4895 -1 5. 10186-102. Low distortion (SFDR): 96 dBc at 100 kHz, VOUT = 2 V p-p NC = NO CONNECT. DO NOT. CONNECT TO THIS PIN. Low power: 3 mA per amplifier Figure 1. ada4895 -1 Single Amplifier (8-Lead SOIC). Low input offset voltage: 350 V maximum High speed OUT1 1 10 +VS. 236 MHz, 3 dB bandwidth (G = +10) IN1 2 9 OUT2.

2 943 V/ s slew rate +IN1 3 8 IN2. 22 ns settling time to VS 4 7 +IN2. 10186-001. DISABLE1 5 ada4895 -2 6 DISABLE2. Rail- to-Rail output Wide supply range: 3 V to 10 V Figure 2. ada4895 -2 Dual Amplifier (10-Lead MSOP). Disable feature 5 30. APPLICATIONS. INPUT CURRENT NOISE (pA/ Hz). Low noise preamplifier INPUT VOLTAGE NOISE (nV/ Hz) 4 24. Ultrasound amplifiers PLL loop filters 3 18. High performance analog-to-digital converter (ADC) drivers Digital-to-analog converter (DAC) buffers 2 12. GENERAL DESCRIPTION VOLTAGE. 1 6. The ada4895 -1 (single) and ada4895 -2 (dual) are high speed CURRENT.

3 Voltage feedback amplifiers that are gain 10 stable with low 0. input noise, Rail- to-Rail output, and a quiescent current of 3 mA per 0. 10186-002. 1 10 100 1k 10k 100k 1M. amplifier. With a 1/f noise of 2 nV/ Hz at 10 Hz and a spurious- FREQUENCY (Hz). free dynamic range (SFDR) of 72 dBc at 2 MHz, the ada4895 -1/ Figure 3. Input Voltage and Current Noise vs. Frequency ada4895 -2 are an ideal solution in a variety of applications, including ultrasound, low noise preamplifiers, and drivers of Table 1. Other Low Noise Amplifiers1. high performance ADCs. The Analog Devices, Inc.

4 , proprietary ven at 100 kHz Bandwidth Supply Part Number(s) (nV/ Hz) (MHz) Voltage (V). next generation SiGe bipolar process and innovative architecture AD8021 490 5 to 24. enables the high performance of these amplifiers. AD8045 3 1000 to 12. The ada4895 -1/ ada4895 -2 have a small signal bandwidth of AD8099 510 5 to 12. 236 MHz at a gain of +10 with a slew rate of 943 V/ s, and settle ADA4841-1/ADA4841-2 80 to 12. to in 22 ns. The wide supply voltage range (3 V to 10 V) ADA4896-2 1 230 3 to 10. of the ada4895 -1/ ada4895 -2 make these amplifiers ideal ADA4897-1/ADA4897-2 1 230 3 to 10.

5 Candidates for systems that require large dynamic range, high ADA4898-1/ADA4898-2 65 10 to 32. gain, precision, and high speed. ADA4899-1 1 600 5 to 12. The ada4895 -1 is available in 8-lead SOIC and 6-lead SOT-23 1. See for the latest selection of low noise amplifiers. packages, and the ada4895 -2 is available in a 10-lead MSOP COMPANION PRODUCTS. package. All packages operate over the extended industrial ADCs: AD7944 (14-bit), AD7985 (16-bit), AD7986 (18-bit). temperature range of 40 C to +125 C. Additional companion products on the ada4895 -1/ ada4895 -2. product page Rev.

6 B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, Box 9106, Norwood, MA 02062-9106, license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 2012 2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

7 Technical Support ada4895 -1/ ada4895 -2 Data Sheet TABLE OF CONTENTS. Features .. 1 Theory of Operation .. 16. Applications .. 1 Amplifier 16. General Description .. 1 Input Protection .. 16. Functional Block Diagrams .. 1 Disable Operation .. 16. Companion Products .. 1 DC Errors .. 17. Revision History .. 2 Bias Current Cancellation .. 17. 3 Noise Considerations .. 18. 5 V (or +10 V) Supply .. 3 Applications Information .. 19. V (or +5 V) Supply .. 4 Using the ada4895 -1/ ada4895 -2 at a Gain < +10 .. 19. V (or +3 V) Supply .. 5 High Gain Bandwidth Application .. 20. Absolute Maximum Ratings.

8 7 Feedback Capacitor Application .. 20. Thermal Resistance .. 7 Wideband Photomultiplier Preamplifier .. 21. Maximum Power Dissipation .. 7 Layout Considerations .. 22. ESD Caution .. 7 Outline Dimensions .. 23. Pin Configurations and Function Descriptions .. 8 Ordering Guide .. 24. Typical Performance Characteristics .. 10. REVISION HISTORY. 4/15 Rev. A to Rev. B. Changes to Amplifier Description Section .. 16. Changes to Ordering Guide .. 24. 12/12 Rev. 0 to Rev. A. Added ada4895 -1 .. Universal Changes to Features Section, General Description Section, and Table 1.

9 1. Added Figure 1; Renumbered Sequentially .. 1. Changes to Table 2 .. 3. Changes to Table 3 .. 4. Changes to Table 4 .. 5. Changes to Figure 4 .. 7. Added Figure 5, Table 7, Figure 6, and Table 8 .. 8. Added Figure 14 and Figure 11. Changes to Figure 24 .. 12. Added Figure 26 and Figure 13. Changes to Amplifier Description Section .. 16. Changes to Noise Considerations Section .. 18. Added Feedback Capacitor Applications Section and Figure 54 .. 20. Updated Outline Dimensions .. 23. Changes to Ordering Guide .. 24. 9/12 Revision 0: Initial Version Rev. B | Page 2 of 24.

10 Data Sheet ada4895 -1/ ada4895 -2. SPECIFICATIONS. 5 V (OR +10 V) SUPPLY. TA = 25 C, G = +10, RF = 249 , RL = 1 k to midsupply, unless otherwise noted. Table 2. Parameter Test Conditions/Comments Min Typ Max Unit DYNAMIC PERFORMANCE. 3 dB Bandwidth VOUT = V p-p 236 MHz VOUT = 2 V p-p 146 MHz VOUT = V p-p, G = +20, RF = 1 k 115 MHz Bandwidth for dB Flatness VOUT = 2 V p-p, RL = 100 MHz Slew Rate VOUT = 6 V step 943 V/ s Settling Time to VOUT = 2 V step 22 ns NOISE/HARMONIC PERFORMANCE. Harmonic Distortion (SFDR) fC = 100 kHz, VOUT = 2 V p-p 96 dBc fC = 1 MHz, VOUT = 2 V p-p 78 dBc fC = 2 MHz, VOUT = 2 V p-p 72 dBc fC = 5 MHz, VOUT = 2 V p-p 64 dBc Input Voltage Noise f = 10 Hz, G = + 2 nV/ Hz f = 100 kHz, G = + 1 nV/ Hz Input Current Noise f = 10 Hz, RF = 10 k , RG = k , RS = 1 k 14 pA/ Hz f = 100 kHz, RF = 10 k , RG = k , RS = 1 k pA/ Hz Hz to 10 Hz Noise G = +101, RF = 1 k , RG = 10 99 nV p-p DC PERFORMANCE.